KINESIOL 1Y03 Chapter Notes - Chapter 13: Coronary Circulation, Magnetic Resonance Angiography, Functional Magnetic Resonance Imaging
22 Jun 2018
School
Department
Course
Professor
Clinical Applications of MRI
Disadvantages
–Patient comfort: claustrophobia
–Ferromagnetic artefact from unsuitable material e.g. stainless steel / titanium
objects which won’t be moved but will damage the image
–Pacemakers can’t be scanned - there are new MR compatible types but they
still have to be switched off during scanning (!)
–Calcification is hard to visualize as there is not a high enough concentration of
free protons
Advantages
–No ionizing radiation c.f. CT
–Multipolar i..e you can image in any plane without moving the patient
–There are many new contrasts coming out
–Exquisite soft tissue resolution which can be manipulated
Can visualize: water content, contrast sensitivity, flow, phase, minerals and crystal
content, perfusion and diffusion
Basic parameter you measure is proton relaxation factor (as pulse is removed)
T1 T2
Longitudinal vector Horizontal vector
Large signal Small signal
Shows good anatomy Very sensitive to pathology
WATER GIVES LOW SIGNAL – shows up
black
WATER GIVES HIGH SIGNAL – shows up
white
Short Tr and Te
find more resources at oneclass.com
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Document Summary
Ferromagnetic artefact from unsuitable material e. g. stainless steel / titanium objects which won"t be moved but will damage the image. Pacemakers can"t be scanned - there are new mr compatible types but they still have to be switched off during scanning (!) Calcification is hard to visualize as there is not a high enough concentration of free protons. Multipolar ie you can image in any plane without moving the patient. Exquisite soft tissue resolution which can be manipulated. Can visualize: water content, contrast sensitivity, flow, phase, minerals and crystal content, perfusion and diffusion. Basic parameter you measure is proton relaxation factor (as pulse is removed) Water gives low signal shows up black. Water gives high signal shows up white. Intracranial mri to visualize the circle of willis no contrast required. Diffusion imaging: rapid imaging of ischaemia, can detect stroke within 30 minutes of onset.
